Improvisation builds Second City into a capital of comedy

To help celebrate its 25th birthday, the Second City comedy troupe has some new trophy cases in the lobby of its Chicago theater. Now they have more space to show off pictures of such former Second Citizens as John Belushi, Joan Rivers, Dan Aykroyd and Bill Murray. Other alumni, including Alan Arkin, Robert Klein and David Steinberg, were back in person recently for an anniversary reunion, which was taped by Home Box Office for airing in April. And in the world beyond, a Second City troupe is established in Toronto, touring companies are on the road, and SCTV is in reruns...